#include <deal.II/multigrid/mg_transfer.h>

Inheritance diagram for MGTransferPrebuilt< VectorType >:

[legend]

Public Member Functions
	MGTransferPrebuilt ()=default

	MGTransferPrebuilt (const MGConstrainedDoFs &mg_constrained_dofs)

virtual	~MGTransferPrebuilt () override=default

void	initialize_constraints (const MGConstrainedDoFs &mg_constrained_dofs)

void	clear ()

template<int dim, int spacedim>
void	build (const DoFHandler< dim, spacedim > &dof_handler)

virtual void	prolongate (const unsigned int to_level, VectorType &dst, const VectorType &src) const override

virtual void	restrict_and_add (const unsigned int from_level, VectorType &dst, const VectorType &src) const override

std::size_t	memory_consumption () const

void	print_matrices (std::ostream &os) const

template<int dim, class InVector , int spacedim>
void	copy_to_mg (const DoFHandler< dim, spacedim > &dof_handler, MGLevelObject< VectorType > &dst, const InVector &src) const

template<int dim, class OutVector , int spacedim>
void	copy_from_mg (const DoFHandler< dim, spacedim > &dof_handler, OutVector &dst, const MGLevelObject< VectorType > &src) const

template<int dim, class OutVector , int spacedim>
void	copy_from_mg_add (const DoFHandler< dim, spacedim > &dof_handler, OutVector &dst, const MGLevelObject< VectorType > &src) const

void	set_component_to_block_map (const std::vector< unsigned int > &map)

void	print_indices (std::ostream &os) const

virtual void	prolongate_and_add (const unsigned int to_level, VectorType &dst, const VectorType &src) const

template<class Archive >
void	serialize (Archive &ar, const unsigned int version)

EnableObserverPointer functionality
Classes derived from EnableObserverPointer provide a facility to subscribe to this object. This is mostly used by the ObserverPointer class.
void	subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

void	unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

unsigned int	n_subscriptions () const

template<typename StreamType >
void	list_subscribers (StreamType &stream) const

void	list_subscribers () const

Static Public Member Functions
static ::ExceptionBase &	ExcNoProlongation ()

static ::ExceptionBase &	ExcMatricesNotBuilt ()

static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)

static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

Protected Member Functions
template<int dim, int spacedim>
void	fill_and_communicate_copy_indices (const DoFHandler< dim, spacedim > &dof_handler)

Protected Attributes
std::vector< types::global_dof_index >	sizes

std::vector< std::vector< std::pair< types::global_dof_index, types::global_dof_index > > >	copy_indices

std::vector< std::vector< std::pair< types::global_dof_index, types::global_dof_index > > >	copy_indices_global_mine

std::vector< std::vector< std::pair< types::global_dof_index, types::global_dof_index > > >	copy_indices_level_mine

bool	perform_plain_copy

std::vector< unsigned int >	component_to_block_map

ObserverPointer< const MGConstrainedDoFs >	mg_constrained_dofs

Private Types
using	map_value_type = decltype(counter_map)::value_type

using	map_iterator = decltype(counter_map)::iterator

Private Member Functions
template<int dim, int spacedim>
void	assert_built (const DoFHandler< dim, spacedim > &dof_handler) const

void	check_no_subscribers () const noexcept

Private Attributes
std::vector< std::shared_ptr< typename internal::MatrixSelector< VectorType >::Sparsity > >	prolongation_sparsities

std::vector< std::shared_ptr< typename internal::MatrixSelector< VectorType >::Matrix > >	prolongation_matrices

std::vector< std::vector< bool > >	interface_dofs

std::atomic< unsigned int >	counter

std::map< std::string, unsigned int >	counter_map

std::vector< std::atomic< bool > * >	validity_pointers

const std::type_info *	object_info

Static Private Attributes
static std::mutex	mutex

Detailed Description

template<typename VectorType>
class MGTransferPrebuilt< VectorType >

Implementation of the MGTransferBase interface for which the transfer operations are prebuilt upon construction of the object of this class as matrices. This is the fast way, since it only needs to build the operation once by looping over all cells and storing the result in a matrix for each level, but requires additional memory.

See MGTransferBase to find out which of the transfer classes is best for your needs.

Definition at line 635 of file mg_transfer.h.

Member Typedef Documentation

◆ map_value_type

using EnableObserverPointer::map_value_type = decltype(counter_map)::value_type

privateinherited

The data type used in counter_map.

Definition at line 238 of file enable_observer_pointer.h.

◆ map_iterator

using EnableObserverPointer::map_iterator = decltype(counter_map)::iterator

privateinherited

The iterator type used in counter_map.

Definition at line 243 of file enable_observer_pointer.h.

Constructor & Destructor Documentation

◆ MGTransferPrebuilt() [1/2]

template<typename VectorType >

MGTransferPrebuilt< VectorType >::MGTransferPrebuilt ( )

default

Constructor without constraint matrices. Use this constructor only with discontinuous finite elements or with no local refinement.

◆ MGTransferPrebuilt() [2/2]

template<typename VectorType >

MGTransferPrebuilt< VectorType >::MGTransferPrebuilt ( const MGConstrainedDoFs & mg_constrained_dofs )

Constructor with constraints. Equivalent to the default constructor followed by initialize_constraints().

Definition at line 48 of file mg_transfer_prebuilt.cc.

◆ ~MGTransferPrebuilt()

template<typename VectorType >

virtual MGTransferPrebuilt< VectorType >::~MGTransferPrebuilt ( )

overridevirtualdefault

Destructor.

Member Function Documentation

◆ initialize_constraints()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::initialize_constraints ( const MGConstrainedDoFs & mg_constrained_dofs )

Initialize the constraints to be used in build().

Definition at line 58 of file mg_transfer_prebuilt.cc.

◆ clear()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::clear ( )

Reset the object to the state it had right after the default constructor.

Definition at line 68 of file mg_transfer_prebuilt.cc.

◆ build()

template<typename VectorType >

template<int dim, int spacedim>

void MGTransferPrebuilt< VectorType >::build ( const DoFHandler< dim, spacedim > & dof_handler )

Actually build the information required for the transfer operations. Needs to be called before prolongate() or restrict_and_add() can be used.

Definition at line 151 of file mg_transfer_prebuilt.cc.

◆ prolongate()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::prolongate	(	const unsigned int	to_level,
		VectorType &	dst,
		const VectorType &	src
	)		const

overridevirtual

Prolongate a vector from level to_level-1 to level to_level using the embedding matrices of the underlying finite element. The previous content of dst is overwritten.

src is a vector with as many elements as there are degrees of freedom on the coarser level involved.

dst has as many elements as there are degrees of freedom on the finer level.

Implements MGTransferBase< VectorType >.

Definition at line 80 of file mg_transfer_prebuilt.cc.

◆ restrict_and_add()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::restrict_and_add	(	const unsigned int	from_level,
		VectorType &	dst,
		const VectorType &	src
	)		const

overridevirtual

Restrict a vector from level from_level to level from_level-1 using the transpose operation of the prolongate method. If the region covered by cells on level from_level is smaller than that of level from_level-1 (local refinement), then some degrees of freedom in dst are active and will not be altered. For the other degrees of freedom, the result of the restriction is added.

src is a vector with as many elements as there are degrees of freedom on the finer level involved.

dst has as many elements as there are degrees of freedom on the coarser level.

Implements MGTransferBase< VectorType >.

Definition at line 107 of file mg_transfer_prebuilt.cc.

◆ memory_consumption()

template<typename VectorType >

std::size_t MGTransferPrebuilt< VectorType >::memory_consumption ( ) const

Memory used by this object.

Definition at line 358 of file mg_transfer_prebuilt.cc.

◆ print_matrices()

template<typename VectorType >

void MGTransferPrebuilt< VectorType >::print_matrices ( std::ostream & os ) const

Print all the matrices for debugging purposes.

Definition at line 344 of file mg_transfer_prebuilt.cc.

◆ copy_to_mg()

template<typename VectorType >

template<int dim, class InVector , int spacedim>

void MGLevelGlobalTransfer< VectorType >::copy_to_mg	(	const DoFHandler< dim, spacedim > &	dof_handler,
		MGLevelObject< VectorType > &	dst,
		const InVector &	src
	)		const

inherited

Transfer from a vector on the global grid to vectors defined on each of the levels separately for the active degrees of freedom. In particular, for a globally refined mesh only the finest level in dst is filled as a plain copy of src. All the other level objects are left untouched.

◆ copy_from_mg()

template<typename VectorType >

template<int dim, class OutVector , int spacedim>

void MGLevelGlobalTransfer< VectorType >::copy_from_mg	(	const DoFHandler< dim, spacedim > &	dof_handler,
		OutVector &	dst,
		const MGLevelObject< VectorType > &	src
	)		const

inherited

Transfer from multi-level vector to normal vector.

Copies data from active portions of an MGVector into the respective positions of a Vector<number>. In order to keep the result consistent, constrained degrees of freedom are set to zero.

◆ copy_from_mg_add()

template<typename VectorType >

template<int dim, class OutVector , int spacedim>

void MGLevelGlobalTransfer< VectorType >::copy_from_mg_add	(	const DoFHandler< dim, spacedim > &	dof_handler,
		OutVector &	dst,
		const MGLevelObject< VectorType > &	src
	)		const

inherited

Add a multi-level vector to a normal vector.

Works as the previous function, but probably not for continuous elements.

◆ set_component_to_block_map()

template<typename VectorType >

void MGLevelGlobalTransfer< VectorType >::set_component_to_block_map ( const std::vector< unsigned int > & map )

inherited

If this object operates on BlockVector objects, we need to describe how the individual vector components are mapped to the blocks of a vector. For example, for a Stokes system, we have dim+1 vector components for velocity and pressure, but we may want to use block vectors with only two blocks for all velocities in one block, and the pressure variables in the other.

By default, if this function is not called, block vectors have as many blocks as the finite element has vector components. However, this can be changed by calling this function with an array that describes how vector components are to be grouped into blocks. The meaning of the argument is the same as the one given to the DoFTools::count_dofs_per_component function.

◆ print_indices()

template<typename VectorType >

void MGLevelGlobalTransfer< VectorType >::print_indices ( std::ostream & os ) const

inherited

Print the copy index fields for debugging purposes.

Definition at line 114 of file mg_level_global_transfer.cc.

◆ fill_and_communicate_copy_indices()

template<typename VectorType >

template<int dim, int spacedim>

void MGLevelGlobalTransfer< VectorType >::fill_and_communicate_copy_indices ( const DoFHandler< dim, spacedim > & dof_handler )

protectedinherited

Internal function to fill copy_indices*. Called by derived classes.

Definition at line 50 of file mg_level_global_transfer.cc.

◆ assert_built()

template<typename VectorType >

template<int dim, int spacedim>

void MGLevelGlobalTransfer< VectorType >::assert_built ( const DoFHandler< dim, spacedim > & dof_handler ) const

privateinherited

This function is called to make sure that build() has been invoked.

◆ prolongate_and_add()

template<typename VectorType >

void MGTransferBase< VectorType >::prolongate_and_add	(	const unsigned int	to_level,
		VectorType &	dst,
		const VectorType &	src
	)		const

virtualinherited

Prolongate a vector from level to_level-1 to level to_level, summing into the previous content of dst.

src is a vector with as many elements as there are degrees of freedom on the coarser level involved.

dst has as many elements as there are degrees of freedom on the finer level.

Reimplemented in MGTransferBlockMatrixFreeBase< dim, Number, TransferType >, MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMatrixFree< dim, Number > >, MGTransferBlockMatrixFreeBase< dim, Number, MGTransferMF< dim, Number, ::MemorySpace::Host > >, MGTransferMF< dim, Number, MemorySpace >, and MGTransferMF< dim, Number, MemorySpace::Host >.

Definition at line 45 of file mg_base.cc.

◆ subscribe()

void EnableObserverPointer::subscribe	(	std::atomic< bool > *const	validity,
		const std::string &	identifier = `""`
	)		const

inherited

Subscribes a user of the object by storing the pointer validity. The subscriber may be identified by text supplied as identifier.

Definition at line 131 of file enable_observer_pointer.cc.

◆ unsubscribe()

void EnableObserverPointer::unsubscribe	(	std::atomic< bool > *const	validity,
		const std::string &	identifier = `""`
	)		const

inherited

Unsubscribes a user from the object.

Note: The identifier and the validity pointer must be the same as the one supplied to subscribe().

Definition at line 151 of file enable_observer_pointer.cc.

◆ n_subscriptions()

unsigned int EnableObserverPointer::n_subscriptions ( ) const

inlineinherited

Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.

Definition at line 322 of file enable_observer_pointer.h.

◆ list_subscribers() [1/2]

template<typename StreamType >

void EnableObserverPointer::list_subscribers ( StreamType & stream ) const

inlineinherited

List the subscribers to the input stream.

Definition at line 339 of file enable_observer_pointer.h.

◆ list_subscribers() [2/2]

void EnableObserverPointer::list_subscribers ( ) const

inherited

List the subscribers to deallog.

Definition at line 199 of file enable_observer_pointer.cc.

◆ serialize()

template<class Archive >

void EnableObserverPointer::serialize	(	Archive &	ar,
		const unsigned int	version
	)

inlineinherited

Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.

This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.

Definition at line 331 of file enable_observer_pointer.h.

◆ check_no_subscribers()

void EnableObserverPointer::check_no_subscribers ( ) const

privatenoexceptinherited

Check that there are no objects subscribing to this object. If this check passes then it is safe to destroy the current object. It this check fails then this function will either abort or print an error message to deallog (by using the AssertNothrow mechanism), but will not throw an exception.

Note: Since this function is just a consistency check it does nothing in release mode.; If this function is called when there is an uncaught exception then, rather than aborting, this function prints an error message to the standard error stream and returns.

Definition at line 53 of file enable_observer_pointer.cc.

Member Data Documentation

◆ prolongation_sparsities

template<typename VectorType >

std::vector< std::shared_ptr<typename internal::MatrixSelector<VectorType>::Sparsity> > MGTransferPrebuilt< VectorType >::prolongation_sparsities

private

Sparsity patterns for transfer matrices.

Definition at line 739 of file mg_transfer.h.

◆ prolongation_matrices

template<typename VectorType >

std::vector< std::shared_ptr<typename internal::MatrixSelector<VectorType>::Matrix> > MGTransferPrebuilt< VectorType >::prolongation_matrices

private

The actual prolongation matrix. column indices belong to the dof indices of the parent cell, i.e. the coarse level. while row indices belong to the child cell, i.e. the fine level.

Definition at line 748 of file mg_transfer.h.

◆ interface_dofs

template<typename VectorType >

std::vector<std::vector<bool> > MGTransferPrebuilt< VectorType >::interface_dofs

private

Degrees of freedom on the refinement edge excluding those on the boundary.

Definition at line 754 of file mg_transfer.h.

◆ sizes

template<typename VectorType >

std::vector<types::global_dof_index> MGLevelGlobalTransfer< VectorType >::sizes

protectedinherited

Sizes of the multi-level vectors.

Definition at line 337 of file mg_transfer.h.

◆ copy_indices

template<typename VectorType >

std::vector< std::vector<std::pair<types::global_dof_index, types::global_dof_index> > > MGLevelGlobalTransfer< VectorType >::copy_indices

protectedinherited

Mapping for the copy_to_mg() and copy_from_mg() functions. Here only index pairs locally owned

The data is organized as follows: one vector per level. Each element of these vectors contains first the global index, then the level index.

Definition at line 348 of file mg_transfer.h.

◆ copy_indices_global_mine

template<typename VectorType >

std::vector< std::vector<std::pair<types::global_dof_index, types::global_dof_index> > > MGLevelGlobalTransfer< VectorType >::copy_indices_global_mine

protectedinherited

Additional degrees of freedom for the copy_to_mg() function. These are the ones where the global degree of freedom is locally owned and the level degree of freedom is not.

Organization of the data is like for copy_indices_mine.

Definition at line 359 of file mg_transfer.h.

◆ copy_indices_level_mine

template<typename VectorType >

std::vector< std::vector<std::pair<types::global_dof_index, types::global_dof_index> > > MGLevelGlobalTransfer< VectorType >::copy_indices_level_mine

protectedinherited

Additional degrees of freedom for the copy_from_mg() function. These are the ones where the level degree of freedom is locally owned and the global degree of freedom is not.

Organization of the data is like for copy_indices_mine.

Definition at line 370 of file mg_transfer.h.

◆ perform_plain_copy

template<typename VectorType >

bool MGLevelGlobalTransfer< VectorType >::perform_plain_copy

protectedinherited

This variable stores whether the copy operation from the global to the level vector is actually a plain copy to the finest level. This means that the grid has no adaptive refinement and the numbering on the finest multigrid level is the same as in the global case.

Definition at line 378 of file mg_transfer.h.

◆ component_to_block_map

template<typename VectorType >

std::vector<unsigned int> MGLevelGlobalTransfer< VectorType >::component_to_block_map

protectedinherited

The vector that stores what has been given to the set_component_to_block_map() function.

Definition at line 384 of file mg_transfer.h.

◆ mg_constrained_dofs

template<typename VectorType >

ObserverPointer<const MGConstrainedDoFs> MGLevelGlobalTransfer< VectorType >::mg_constrained_dofs

protectedinherited

The mg_constrained_dofs of the level systems.

Definition at line 389 of file mg_transfer.h.

◆ counter

std::atomic<unsigned int> EnableObserverPointer::counter

mutableprivateinherited

Store the number of objects which subscribed to this object. Initially, this number is zero, and upon destruction it shall be zero again (i.e. all objects which subscribed should have unsubscribed again).

The creator (and owner) of an object is counted in the map below if HE manages to supply identification.

We use the mutable keyword in order to allow subscription to constant objects also.

This counter may be read from and written to concurrently in multithreaded code: hence we use the std::atomic class template.

Definition at line 227 of file enable_observer_pointer.h.

◆ counter_map

std::map<std::string, unsigned int> EnableObserverPointer::counter_map

mutableprivateinherited

In this map, we count subscriptions for each different identification string supplied to subscribe().

Definition at line 233 of file enable_observer_pointer.h.

◆ validity_pointers

std::vector<std::atomic<bool> *> EnableObserverPointer::validity_pointers

mutableprivateinherited

In this vector, we store pointers to the validity bool in the ObserverPointer objects that subscribe to this class.

Definition at line 249 of file enable_observer_pointer.h.

◆ object_info

const std::type_info* EnableObserverPointer::object_info

mutableprivateinherited

Pointer to the typeinfo object of this object, from which we can later deduce the class name. Since this information on the derived class is neither available in the destructor, nor in the constructor, we obtain it in between and store it here.

Definition at line 257 of file enable_observer_pointer.h.

◆ mutex

std::mutex EnableObserverPointer::mutex

staticprivateinherited

A mutex used to ensure data consistency when accessing the mutable members of this class. This lock is used in the subscribe() and unsubscribe() functions, as well as in list_subscribers().

Definition at line 280 of file enable_observer_pointer.h.

The documentation for this class was generated from the following files:

include/deal.II/multigrid/mg_transfer.h
source/multigrid/mg_transfer_prebuilt.cc

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Member Typedef Documentation

◆ map_value_type

◆ map_iterator

Constructor & Destructor Documentation

◆ MGTransferPrebuilt() [1/2]

◆ MGTransferPrebuilt() [2/2]

◆ ~MGTransferPrebuilt()

Member Function Documentation

◆ initialize_constraints()

◆ clear()

◆ build()

◆ prolongate()

◆ restrict_and_add()

◆ memory_consumption()

◆ print_matrices()

◆ copy_to_mg()

◆ copy_from_mg()

◆ copy_from_mg_add()

◆ set_component_to_block_map()

◆ print_indices()

◆ fill_and_communicate_copy_indices()

◆ assert_built()

◆ prolongate_and_add()

◆ subscribe()

◆ unsubscribe()

◆ n_subscriptions()

◆ list_subscribers() [1/2]

◆ list_subscribers() [2/2]

◆ serialize()

◆ check_no_subscribers()

Member Data Documentation

◆ prolongation_sparsities

◆ prolongation_matrices

◆ interface_dofs

◆ sizes

◆ copy_indices

◆ copy_indices_global_mine

◆ copy_indices_level_mine

◆ perform_plain_copy

◆ component_to_block_map

◆ mg_constrained_dofs

◆ counter

◆ counter_map

◆ validity_pointers

◆ object_info

◆ mutex